7307.11.00.45 - For cast-iron soil pipe

This HTS category, 7307.11.00.45, specifically classifies fittings for cast-iron soil pipe. These fittings are designed to connect, divert, or terminate cast-iron pipes used in drainage and sewage systems. Examples include specialized couplings, elbows, and branches explicitly manufactured for this purpose. The key distinguishing characteristic is their intended application within cast-iron soil pipe systems, which often have unique dimensional and sealing requirements.

Distinguishing this category from its sibling, 7307.11.00.60 ("Other"), is crucial. While both fall under "Of nonmalleable cast iron" and "Other" fittings, this node is limited to fittings solely for soil pipe applications. The sibling category would encompass other types of nonmalleable cast-iron fittings not specifically designated for soil pipe use.

As this is a leaf node, there are no further subcategories to introduce. Classification at this level relies on confirming that the fitting is indeed made of nonmalleable cast iron and is specifically intended for use in conjunction with cast-iron soil pipes, as opposed to other types of pipe fittings or general purpose cast-iron components.